1. Questionable utility. Sure, there's an icon for 'copy' and 'paste', but I cannot imagine it being easier for anyone to hunt along a non tactile touch surface located in an awkward position to hit that icon rather than just using Ctrl + C (or the mouse, which you've just made your selection with). That's a shortcut almost everyone knows.
2. Poor/Non-existent third party software support. Basically works for IE and Windows Explorer and that's it.
3. Software that drives the screen is poorly made and crashes occasionally.
4. The strip is a 2 bit/pixel B&W screen that is hard to read and is not backlit.